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The Effect of a Secondary Air Injection Angle on the Deviation of Flue Gas Flow Rate at a Tangentially Fired Furnace Outlet

Zhao Yuan, Dong Pe ng, Qin Yuk un, et al (College of Energy Science and Engineering under the Harbin Instit ute of Technology)  
In a tangentially fired large sized boiler there generally occurs a common phen o menon of flue gas flow deviation on the right and left side of both the upper fu rnace and the convection flue. This is generally attributed to the flue gas resi dual rotation. An analytical study was conducted to address this issue. Moreover , a 410 t/h boiler was selected as a specific object of study in this regard. By the use of a numerical simulation method and based on an initial design scheme, the authors have made changes in such flow parameters as secondary air injectio n angle and the secondary air inverse tangential flow at the furnace uppermost l ayer. After a summing up and analysis of the simulation results a feasible sche m e was proposed to lower the deviation of the flue gas speed at the furnace outle t.
【CateGory Index】: TK224
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